Protector® PVC Perchloric Acid & Acid Digestion Laboratory Hoods BY-PASS AIR HOOD FOR USE WITH REMOTE BLOWER (PVC-Lined) PART 1 - GENERAL 1.01 Scope and Classification 1.01.01 This specification covers the requirements for the purchase of bench-mounted PVC- lined perchloric acid and acid digestion laboratory fume hoods for remote exhaust blower systems. It is written to cover the by-pass design configuration, vapor-proof electrical configuration and service fixture configuration that are available on these hoods. Contact Labconco for information on hoods with explosion-proof electrical configuration. 1.01.02. Bench-mounted laboratory fume hoods in 4, 6, and 8 foot widths and internal depths of 30" are covered by this specification. 1.01.03. This specification sets the intent for quality, performance and appearance. 1.02 Requirements: 1.02.01 Laboratory hoods shall be of double wall construction with epoxy-coated, cold-rolled steel exterior and PVC internal liner and baffle. Hood shall be equipped with a washdown system behind the baffle and a feed system for duct washdown. The vertical rising sash assemblies shall feature a 3/16" thick tempered safety glass sash on perchloric acid hoods or 1/4" Lexan* sash on acid digestion hoods with single counterbalance sash weight. Sashes shall have a fully open height of 28" from the work surface and provide a viewing height of 32.15". Hoods shall be provided with an air foil across the bottom of the sash area with 5 rows of perforations to maintain airflow should the operator inadvertently block the airflow. Access for maintenance shall be from both the front and exterior sides of the hood. All hood-mounted service fixtures, where provided, shall be pre-plumbed except for the inlet tubing. All electrical services shall be pre-wired to a single point junction box on the top of the hood. Hood shall be of one piece construction and shall pass through a 41.25" opening without disassembly. 1.03 Quality Assurance: 1.03.01 The hood manufacturer shall maintain a testing facility at its place of business for the testing of bench-mounted laboratory hoods in accordance with ASHRAE Standard 110- 95. Both hoods and installation shall be in conformance to good construction practice and approved by the owner/user. Only hood manufacturers who have had fume hoods as a principal product for ten years will be considered. The hood manufacturer's manufacturing and test facilities and its quality control procedures must be available for owner/user inspection. 1.04 References: 1.04.01 The laboratory hoods shall conform to the following regulations and standards: SEFA - #1-2000 (Laboratory Fume Hoods) NFPA - #45 (Fire Protection for Laboratories Using Chemicals 2000) section 6-1 through 6- 14 ASTM-E-84 - Surface Burning Characteristics of Building Materials ASHRAE - 110-95 (Method of Testing Performance of Laboratory Fume Hoods) ANSI - Std. Z 9.5 (Laboratory Ventilation) UL -3101 (Electrical Wiring) UL-1805 (Hood Construction) CAN/CSA Standard C22.2 No. 1010.1 1.05 Submittals: 1.05.01 Laboratory hood specification sheets and product manuals shall be submitted by the hood manufacturer upon request. The hood supplier shall submit shop drawings when necessary for clarification. 1.05.02 Sample pieces of the hood exterior wall material, interior liner and baffle material, work surface material, and color selection chips shall be available from the hood manufacturer upon request. 1.06 Delivery and Storage: 1.06.01 Laboratory hoods and supporting surfaces shall be delivered adequately protected from damage during shipment. 1.07 Warranty 1.07.01 Manufacturer's warranty against defects in material or workmanship on its fume hoods shall be for 1 year from date of installation or 2 years from date of purchase, whichever is sooner, shall include replacement of parts (except lamps) and labor. PART 2 - PRODUCTS 2.01 Acceptable Manufacturer: 2.01.01 Labconco Corporation, 8811 Prospect Avenue, Kansas City, Missouri 64132, Protector Laboratory Hoods, model numbers as follows: Protector PVC Perchloric Acid Hoods 4' Model with 2 service fixtures and washdown fixture: 4882300 6' Model with 2 service fixtures and washdown fixture: 7282300 8' Model with 2 service fixtures and washdown fixture: 9682300 Protector PVC Acid Digestion Hoods 4' Model with 2 service fixtures and washdown fixture: 4882400 6' Model with 2 service fixtures and washdown fixture: 7282400 8' Model with 2 service fixtures and washdown fixture: 9682400 2.02 Materials: 2.02.01 Hood exterior construction shall be 20 gauge (or heavier) cold rolled sheet steel or galvanized steel supports. All exterior painted surfaces shall be epoxy-coated. Base metal material shall be properly prepared for epoxy coating. 2.02.02 Hood interior liner, baffle and integral work surface with drainage trough shall be unplasticized PVC. 2.02.03 Corner posts shall be 16 gauge cold-rolled steel with epoxy-coated finish. 2.02.04 Exhaust connection shall be PVC pipe. 2.02.05 Optional rear exterior finish panel shall be epoxy-coated steel. 2.02.06 Hose connectors shall be chemically-resistant, glass-filled polypropylene. 2.02.07 Gooseneck faucet shall be gray PVC. 2.02.08 Sash on perchloric acid hoods shall be 3/16" thick tempered safety glass surrounded by an epoxy-coated aluminum and PVC frame. 2.02.09 Sash on acid digestion hoods shall be 1/4" thick Lexan* surrounded by an epoxy- coated aluminum and PVC frame. 2.02.10 Hood service fixtures shall feature 1/4" copper tubing with extruded brass valves and rotating seats, TFE coated silicone bronze stem and TFE packing. Gas valves shall feature brass service lines. 2.02.09 Sash foil shall be 18 gauge epoxy-coated cold-rolled steel and have 5 rows of perforations. 2.02.10 The supporting surface, located underneath the integral PVC work surface, shall be black enamel-coated lamiboard. 2.03 Specific Fabrication Requirements: 2.03.01 Overall exterior dimensional information is as follows: 4 ft. 48" w x 59" h x 39.2" d 6 ft. 72" w x 59" h x 39.2" d 8 ft. 96" w x 59" h x 39.2" d 2.03.02 The bench-mounted laboratory hood with by-pass design shall minimize face velocity fluctuations as the sash is raised or lowered. With the sash positioned six inches above the air foil, the average inflow velocity shall not be less than twice the selected full open face velocity nor greater than three times that amount. 2.03.03 Exhaust air volume requirements and static pressure losses shall be as described in the table. 2.03.04 The exhaust connection shall be 12.75" OD. The 4 and 6 foot hoods shall have one exhaust connection. The 8 foot hoods shall have two exhaust connections. 2.03.05 Corner posts shall be pre-punched and plugged to accommodate up to 4 service fixtures and 2 electrical receptacle boxes on each side. Right-hand corner post shall have ADA-compliant light and blower switches. Corner posts shall have front access panels (one on each side) to allow for maintenance to the service fixtures from the front of the hood. 2.03.06 Interchangeable removable side panels, removable front panel and front access panels shall provide access to plumbing fixtures, electrical wiring, counterbalance sash weights, and lighting fixtures, where specified on the individual hoods. All services shall be accessible from the front of the hood. 2.03.07 The air foil shall be located directly across the bottom of the sash opening to allow the air to bypass underneath and through the foil's perforated openings and sweep across the work surface to prevent any back flow of fumes escaping from the front of the hood. The foil shall be at least 4" wide and extend back under the sash to prevent closure of the lower by-pass opening when the sash is in the fully closed position. The air foil shall have a large aerodynamic radius to sweep the air into the hood with minimal turbulence and perforated to pull inflow air from beneath so that clean air continually flows over the foil creating a constant protective barrier from contaminants. This airflow shall continue even if blocked by the presence of the operator. 2.03.08 The front and side exterior of the hood shall feature baked on powder epoxy paint applied electrostatically. 2.03.09 The liner and baffle(s) shall be fabricated of type 1, unplasticized PVC. The liner shall be one piece welded construction with coved corners and without interior access panels. All joints shall be ground smooth and polished. The tamper-resistant, preset baffle shall be one piece without slots or need for adjustment. The baffle shall provide uniform draw throughout the fume cavity. Baffle(s) shall be removable for cleaning. 2.03.10 The integral work surface shall have a 1/4" deep dish seamlessly welded to the hood interior. The washwater drainage trough shall be located in the rear edge of the work surface to provide for the drainage of the effluent water. 2.03.11 Trough shall feature 2" diameter drain connection at the right end. 2.03.12 Hoods shall be equipped with an internal washdown system to wash behind the baffle serviced by an additional cold water valve and supply line. There shall be a connection point to the internal manifold for feed to the duct system wash rings. This connection shall be plugged upon delivery. 2.03.13 Hoods shall have a single vertical-rising sash counterbalanced by a single weight suspended by two vinyl-coated stainless steel cables that pass through ball bearing pulleys. The sash shall operate smoothly without tilting when raised or lowered from either end and shall remain at rest in any open position. All sashes shall be framed with extruded epoxy- coated aluminum and PVC. 2.03.14 The hoods shall be equipped without service fixtures or shall be provided with a total of up to 8 service fixtures as required capable of providing hot and cold tap water (flow rate 3.5 GPM or 13.25 LPM at 67 psi at full open, 3.5 turns), natural gas (theoretical flow rate of 71CFM at 100 psi, provides 1095 BTU/Sec at a density of .667 Lbs/CU. FT.), air (theoretical flow rate of 59 CFM at 100psi), vacuum (theoretical flow rate of 6 CFM at 10 psi), nitrogen, argon and low pressure steam. Fixtures are rated at maximum pressure of 200 psi with a working pressure of 125 psi. Coefficient of flow for the valve, Cv=0.43. Services shall be provided through remote-controlled valves and 6-serration hose connectors located inside the fume hood cavity. Services shall be pre-plumbed except for the inlet tubing using 1/4" copper tubing except for the upper right hand fixture shall be 1/4" brass for use with gas. Fixture handles shall be plastic and color coded as well as labeled for the designated type of service. Specialty service fixtures are available upon request including CW gooseneck with and without, as required, vacuum breaker (3/8" lines) and SST valves with 1/4" SST lines for purified water. Other service fixtures shall be available from various valve manufacturers (consult Labconco). 2.03.15 Hoods shall be provided with high-efficiency, instant-start, T8 fluorescent lighting systems (bulbs included) located behind a laminated safety glass shield on top of the hood liner. The fluorescent light assemblies shall be serviceable from outside the fume hood cavity. Hoods shall be provided with a light switch, blower switch, and all internal wiring to a single point junction box. 4 Foot Hoods - 2 each, 3-foot 25-watt fluorescent lamps 6 Foot Hoods - 2 each, 4-foot 32-watt fluorescent lamps 8 Foot Hoods - 4 each, 3-foot 25-watt fluorescent lamps 2.03.16 Hoods shall feature up to four 115 volt, three-wire polarized and grounded electrical duplex receptacles as required. 2.03.17 Hood rear exterior finish panel shall be optional. 2.03.18 A lamiboard surface shall be provided to support the integral PVC work surface. 2.03.19 Face velocity alarms to monitor hood performance (not included with hood) are recommended and shall be available for factory or field installation. PART 3 – EXECUTION 3.01 Examination 3.01.01 Verify equipment rough-in before proceeding with work. 3.01.02 Coordinate with other trades for the proper and correct installation of plumbing and electrical rough-in and for rough opening dimensions required for the installation of the hood. 3.02 Installation 3.02.01 Install according to manufacturer's instructions. 3.02.02 Install according to standards required by authority having jurisdiction. 3.02.03 Install equipment plumb, square and straight with no distortion and securely anchor as required. 3.02.04 Sequence installations to ensure utility connections are achieved in an orderly and expeditious manner. 3.02.05 Touch up minor damaged surfaces caused by installation. Replace damaged components as directed by Architect. 3.03 Adjusting 3.03.01 Adjust operating equipment, with exception of air moving equipment, to efficient operation for its intended use, and as required by the manufacturer. 3.04 Cleaning 3.04.01 Clean equipment, casework, countertops and all other surfaces as recommended by the manufacturer, rendering all work in a new and unused appearance. 3.04.02 Clean adjacent construction and surfaces that may have been soiled in the course of installation of work in this section. 3.05 Protection of Finished Work 3.05.01 Provide all necessary protective measures to prevent exposure of equipment and surfaces from exposure to other construction activity. 3.05.02 Advise contractor of procedures and precautions for protection of material and installed equipment and casework from damage by work of other trades. 3.06 Demonstration 3.06.01 Provide systems demonstration and demonstrate all equipment operations and functions. APPENDIX - TESTING CRITERIA X.X.X. Reverse Airflows and Containment - When tested "As Manufactured" ("AM"), the hood shall provide containment less than or equal to 0.10 ppm when tested per ASHRAE Standard 110-95 and under the conditions specified in section X.X.X.01 of this specification. X.X.X.01 Test Criteria: The following test criteria shall apply when determining the AM performance rating. Face velocity: 80 or 100 feet per minute ±20% Ambient temperature: 68 to 74 degrees F Test procedures: Labconco test procedure PH-1-86 is available upon request from Labconco Corporation, 8811 Prospect Avenue, Kansas City, Missouri 64132 X.X.X.02 Containment per ASHRAE 110-95 - At a tracer gas release rate of 4 liters per minute, the AM leakage shall not exceed 0.10 ppm (rating = 4 AM 0.10) X.X.X.03 Flow Visualization - The following excerpt sections of ASHRAE 110-95 are used to define the AM test criteria for reverse airflow and exhaust capacity. X.X.X.03.01 Flow Visualization - Swab a strip of titanium tetrachloride along both walls and the hood floor in a line parallel to the hood face and 6 inches (152 mm) back into the hood. (Titanium tetrachloride is corrosive to the skin and extremely irritating to the eyes and respiratory system.) Swab an 8" (200 mm) circle on the baffle of the hood on centerline and on each side. Define air movement toward the face of the hood as reverse airflow and define lack of movement as dead air space. Swab the work surface, making sure to swab lines around all equipment in the hood. All smoke should be carried to the back of the hood and out. Test the operation of the lower air bypass air flow opening by running the cotton swab under the air foil. Before going on to the next test, move the cotton swab around in the face of the hood. If there is any outfall, the exhaust capacity test should not be made. X.X.X.03.02 Exhaust Capacity - Ignite and place a 30-second smoke bomb near the center of the work surface, making sure that the hole on the side of the smoke bomb faces into the hood. After the smoke bomb begins to work, pick it up with tongs and move it around in the hood. There should be no visual or odor indications of smoke outside the hood. X.X.X.04 Installed Performance - Per ASHRAE 110-95, the "AU" (As Used) requirement involves the design of the room supply system and the toxicity of the materials handled in the hood. The AU specification should be tailored to suit the needs of the laboratory room location. *Lexan® is a registered trademark of General Electric Company.